Recycling Solar Cells for Hydrogen Production Coupling Hydrazine Degradation with Entropy-Driven High-Chaos Nickel Molybdenum Phosphorus Sulfide Oxides

Photovoltaic-electrolysis water splitting is a bright solution toward large-scale power grid hydrogen generation. However, it is challenged by the huge consumption of solar cells and the sluggish anodic reaction of oxygen evolution. Here, we demonstrate hydrogen production by the residual power of waste solar cell coupling hydrazine degradation. An entropy-driven high-chaos nickel molybdenum phosphorus sulfide oxide monolithic electrode is reported with an extremely small voltage of 0.039 V at 10 mA cm–2 and an excellent permanency under 70 h for bifunctional overall hydrazine splitting. Scanning electrochemical microscopy (SECM) observation and density functional theory (DFT) calculations demonstrate the notability of the high-chaos feature in its efficient bifunctionality. Driven by an ultralow 0.551 V voltage coming from a waste solar cell, the bifunctional electrode can achieve 1600 mA cm–2. This large current density is enough to satisfy industry requirements. This high-chaos and bifunctional electrode combined with a waste solar cell enables further opportunities for future practical solar cell recycling and energy-saving hydrogen production.